By John M. Grondelski, EWTN - But who do you say I am?”... It’s the central question of the Gospel for the 21st Sunday in Ordinary Time. It’s the central question of the Gospel, period. If you look at the Gospel of Mark, it’s right there in Chapter 8, smack dab in the literal center of that Gospel. It’s the central question of Christianity, period... The Petrine confession of faith at Caesarea Philippi is the heart of the Gospel because it is an existential question. Jesus asks his apostles two questions. The first is a reporter’s question: “Who do people say I am?”